{pkgs, ...}: {
  config = {
    # added to the environment for manual verification via interactiveDriver if necessary
    environment.systemPackages = with pkgs; [fetchmail msmtp procmail openssl];
    systemd.tmpfiles.settings."10-mailtest" = let
      dirPerms = {
        user = "root";
        mode = "0700";
      };
    in {
      "/root/mail".d = dirPerms;
      "/root/.procmailrc"."L+".argument = "${pkgs.writeText ".procmailrc" ''
        DEFAULT=$HOME/mail
      ''}";
    };
  };
}